When I was doing the previous LAB, I came across the router id, and I told you that I will speak about it later.
The router id in OSPF is nothing more than how the OSPF router is represented to his neighbor. You can think it is like the name of the router in the OSPF process.
It is very advisable that you put a router id manually on the router when configuring OSPF because this will help you to know to which other router you are forming a neighborship specially if you have a very big network.
The router id can be set statically, but in case not set then it pick up an IP address automatically. Here how this happens:
| Priority 1 | Router id set manually |
| Priority 2 | The highest IP address of a loopback interface |
| Priority 3 | The highest IP address of an active physical interface |
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